Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings

A. I. Hernández-Juárez, G. Tavares-Velasco, R. Gaitán

We study the flavor-changing neutral current contributions to the trilinear neutral gauge boson couplings $Z\gamma V^{\ast }$ ($V=Z$, $\gamma$) at the one-loop level. Only the $CP$-conserving fo…